Net Loss Per Share - Anti-dilutive common equivalent shares (Details) - shares	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Net Loss Per Share
Total anti-dilutive common equivalent shares	45,972,283	41,756,164
Stock options
Net Loss Per Share
Total anti-dilutive common equivalent shares	13,740,728	17,170,640
Restricted stock units
Net Loss Per Share
Total anti-dilutive common equivalent shares	11,578,865	3,932,587
Outstanding warrants
Net Loss Per Share
Total anti-dilutive common equivalent shares	20,652,690	20,652,937